if (pets->ContainsKey("mary")) Console::WriteLine("ok");

using namespace System;
using namespace System::Collections;

int main()
{
array<String^>^ input = {"joe:cat", "mary:turtle", "bill:canary"};
Hashtable^ pets = gcnew Hashtable; array<Char>^ sep = {':'}; array<String^>^ currentry;

for each(String^ entry in input)
{
currentry = entry->Split(sep, StringSplitOptions::RemoveEmptyEntries);
pets->Add(currentry[0], currentry[1]);
}

if (pets->ContainsKey("mary")) Console::WriteLine("ok");
}

if (pets.find("mary") != pets.end()){
std::cout << "ok" << std::endl;
}

int main()
{
if (pets.find("mary") != pets.end()){
std::cout << "ok" << std::endl;
}
}

if (pets.count("mary") > 0)
cout << "ok" << endl;

#include <iostream>
#include <map>

using namespace std;

int main()
{
map<string,string> pets;

pets["joe"] = "cat";
pets["mary"] = "turtle";
pets["bill"] = "canary";

if (pets.count("mary") > 0)
cout << "ok" << endl;
}